[5.3] Allow passing a Closure to View::share() method (#15312)

* [5.3] Allow passing a Closure to View::share() method

Allows you to pass a Closure as the $value parameter to View::share() method.

* Fix StyleCI

src/Illuminate/View/View.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\View;
 
+use Closure;
 use Exception;
 use Throwable;
 use ArrayAccess;
@@ -161,6 +162,8 @@ protected function gatherData()
         foreach ($data as $key => $value) {
             if ($value instanceof Renderable) {
                 $data[$key] = $value->render();
+            } elseif ($value instanceof Closure) {
+                $data[$key] = call_user_func($value);
             }
         }